// somethings broken here
	String dropFile = ConfigFile("foobar");
	VectorMap<String, ClipData> clip;
	AppendFiles(clip, { dropFile } );
	if (DoDragAndDrop(clip, img, DND_COPY) == DND_COPY) {
		// receiver sees {"f","o","o","b","a","r" } not "foobar"
	}

#include <CtrlLib/CtrlLib.h>
#include <TabBar/TabBar.h>

using namespace Upp;

struct DragTabBug : TopWindow {
	TabBar tabs;
	DragTabBug() {
		AddFrame(tabs);
	}
	void LeftDrag(Point p, dword keyflags) override {
		Image i = CtrlImg::new_doc();
		VectorMap<String, ClipData> clip;
		Append(clip, i);
		DoDragAndDrop(clip, i);
	}
};

GUI_APP_MAIN
{
	DragTabBug win;
	win.Run();
}

void AppendFiles(VectorMap<String, ClipData>& clip, const Vector<String>& files)
{
	WString wfiles;
	for(int i = 0; i < files.GetCount(); i++)
		wfiles << files[i].ToWString() << (wchar)0;
	sDROPFILES h;
	h.unicode = true;
	h.offset = sizeof(h);
	GetCursorPos(&h.pt);
	h.nc = TRUE;
	String data;
	data.Cat((byte *)&h, sizeof(h));
	data.Cat((byte *)~wfiles, 2 * (wfiles.GetCount() + 1)); // Windows wants 2 bytes unicode string instead of 4 bytes we are providing
	clip.GetAdd("files") = ClipData(data);
}

TheIDE has crashed the last time it was run. As the possible cause is libclang incompatibility, we are disabling Assist features for now.
You can have them reenabled in Setup / Settings..

01:20:55:490 INFO  LoadLibClang0(): libclang path: "/usr/lib/libclang.so"

libclang additional compiler options do not seem do be correct. Assist might not work.

menu.Add(AK_SETMAIN, IdeImg::MainPackage(), THISBACK(NewMainPackage))
			.Enable(!IdeIsDebugLock() && !IdeIsBuilding())
			.Help("Select global configuration (var), select / add main project package");

TheIDE has crashed the last time it was run. As the possible cause is libclang incompatibility, we are disabling Assist features for now.
You can have them reenabled in Setup / Settings..

 /**
  * An AST deserialization error has occurred.
  */
 CXError_ASTReadError = 4